It offers an updated, objective summary of nutrition and mineral feed for domestic ruminants. One chapter is devoted to the role of mineral elements in optimising fermentations in the rumen. Each element of nutritional interest, macronutrients and trace elements, are addressed in turn, focusing on the functions within the organism, the effects of too much or too little feed, the recommended daily intake and inputs by the main food categories. "New", potentially essential or harmful elements are then discussed. A few practical considerations on the mineral complementation strategy for rations are also addressed. Audience: researchers, professional livestock breeders, teachers and students in the agronomic and veterinary sectors.